In the winter I was sleeping in a sleeping bag with my normal bed covers and in sweatpants and a sweatshirt. Ever since that year I've been super sensitive to cold weather. It has been nearly 4 years now and I am finally not shivering when it is lower than 70 degrees! It has been very strange and I am always dressed in more layers than anyone around me including gloves in my work office with the thermostat set at 70 degrees. I've decided I'm just weird. (But my tolerance for cold seems to be returning slowly.)
Maybe that's just it and better: your tolerance to cold is slowly returning. (You were tough!)

We have to give ourselves time to acclimatize ...while we're still young and healthy.

But I don't think I will solve my Reynauld's syndrome --I've gone to 2 doctors about this. I just have to be careful.